EMBRYOLOGY: PRACTICE 4

SINGLE BEST OPTION SERIES

         INSTRUCTION: SELECT THE SINGLE BEST OPTION

1.         Which of the following is incorrect?
   a.       Infertility is a problem for about 15% to 30% of couples.
   b.      Men with 20 million sperms per millilitre or 50 million sperms per ejaculate are usually fertile.
   c.       Vasectomy and tubal ligation are effective means of contraception.
   d.      Multiple births rarely occur with conception achieved by assisted reproductive technology (ART)
   e.      The risk of producing malformed offspring by in vitro fertilization is low.
   2.       The process of establishing the three germ cell layers (namely ectoderm, mesoderm and endoderm) during embryogenesis is known as:
   a.       Cleavage
   b.      Gastrulation
   c.       Neurulation
   d.      Myelination
   e.      In vitro fertilization
   3.       The features of Kartagener syndrome include the following except:
   a.       Caudal dysgenesis
   b.      Chronic sinusitis
   c.       Bronchiectasis
   d.      Dextrocardia
   e.      Abnormal cilia
   4.       Some of the approaches used for assisted reproductive technology (ART) include the following except:
   a.       Gamete intrafallopian transfer (GIFT)
   b.      Zygote intrafallopian transfer (ZIFT)
   c.       Intracytoplasmic sperm injection (ICSI)
   d.      In vitro fertilization (IVF)
   e.      None of the above
   5.       Which of the following is incorrect about cleavage during embryogenesis:
   a.       Blastomeres are formed from mitotic divisions of the zygote.
   b.      Approximately three days after fertilization, cells of the compacted embryo divide to form a 16-cell morula (mulberry).
   c.       The outer cell mass of the morula forms the embryo proper.
   d.      The trophoblast contributes to the formation of the placenta
   e.      Inner cells of the morula constitute the inner cell mass.
   6.       Concerning embryogenesis, the most important event occurring during the third week of gestation is:
   a.       Implantation
   b.      Gastrulation
   c.       Neurulation
   d.      Epiblast formation
   e.      Establishment of uteroplacental circulation
   7.       Which of the following statements is incorrect?
   a.       By the first week of human in utero development, the zygote has begun implantation in the uterine mucosa
   b.      Embryonic stem cells are pluripotent
   c.       Adult stem cells are multipotent
   d.      Spontaneous abortion may be a natural means of screening embryos for defects thereby reducing the incidence of congenital malformations.
   e.      The zona pellucida of the graafian follicle usually disappears before implantation of the blastocyst.
   8.       The layers of the uterus does not include:
   a.       Endometrium
   b.      Myometrium
   c.       Perimetrium
   d.      All of the above
   e.      None of the above.
   9.       The second week of development of human embryo is known as the “week of twos” because of the following except:
   a.       The trophoblast differentiates into cytotrophoblast and syncytiotrophoblast
   b.      The morula forms the embryoblast and trophoblast  
   c.       The embryoblast forms the epiblast and hypoblast
   d.      The extraembryonic mesoderm splits into somatopleure and splanchnopleure
   e.      Two cavities, amniotic and yolk sac cavities are formed.
   10.   At the time of implantation of the blatocyst, the mucosa of the uterus is in the .............phase of the menstrual cycle:
   a.       Follicular
   b.      Secretory
   c.       Proliferative
   d.      Menstrual
   e.      None of the above
   
   
   
   
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